Search Results

This paper gives details of the drag and dirt deposition mechanisms related to rear view mirrors. The major design parameters affecting mirror-generated drag and dirt deposition are described. A detailed analysis of the mirror noise properties is not covered for reasons of brevity. A range of test methods is also described which can be successfully used in the mirror optimisation process. The detailed drag breakdown of several rear view mirrors has been made by use of a combination of balance and pressure measurements. The drag breakdown gives an insight into the drag mechanisms and identifies the critical geometry parameters. It is concluded that the relatively high level of drag experienced by some of today's mirrors is primarily the result of premature tip separation and/or an unnecessarily large mirror foot. A level of drag close to the minimum possible, for a given mirror glass area, can be achieved by optimisation of the tip and foot areas.